Operating instructions

101
Table 60 — Master/Slave Alarm Code
LEGEND
Table 61 — Illegal Configuration Alarm Code
Repeated Low Suction Temperature Protection
Alarm 93 — Circuit A (P.40)
Alarm 94 — Circuit B (P.41)
Alarm 95 — Circuit C (P.42)
Criteria for Trip — The criterion is tested when the circuit is
ON. If the circuit operates and if more than 8 successive circuit
capacity decreases (stop the compressor) have occurred because
of low suction temperature protection overrides, the circuit
alarm will be tripped. If no override has occurred for more than
30 minutes, the override counter will be reset to zero.
Action to be Taken — ALARM_LED will be set to blinking.
Alert relay will be energized.
Reset Method — Automatic, when the override counter returns
to zero. If the alarm is cleared via the Manual method, the
counter will be forced to zero.
Possible Causes — If this condition is encountered, check the
following items:
• suction transducer for accuracy
• suction transducer wiring
• EXV operation
• proper refrigerant charge (undercharged)
• evaporator loop for low water flow
• evaporator leaving water temperature
• suction service valve to be sure it is open
• plugged filter drier
Alarm 96 — Low Entering Water Temperature in Heating
(P.43)
NOTE: Alarm 96 is not used or supported. If this condition is
encountered, confirm machine configuration.
Condenser Default
Alarm 97 — Pump 1 (P.73)
Alarm 98 — Pump 2 (P.74)
NOTE: Alarms 97 and 98 are not used or supported. If this
condition is encountered, confirm machine configuration.
High Discharge Temperature
Alarm 99 — Circuit A (P.78)
Alarm 100 — Circuit B (P.79)
Alarm 101 — Circuit C (P.80)
Criteria for Trip — The criterion is tested when the compres-
sor is operating. This alarm will be tripped if the discharge gas
temperature is higher than 212 F (100 C) for more than
90 seconds.
Action to be Taken — The affected compressor will be
stopped.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• noncondensables in the refrigerant circuit
• condenser air re-circulation
• proper refrigerant charge (undercharged) EXV operation
• EXV operation
• operation beyond the limit of the machine
• condenser coils for debris or restriction
• condenser fans and motors for proper rotation and operation
• the discharge service valve to be sure that it is open, check
the discharge pressure transducer for accuracy
• confirm unit configuration
Low Economizer Pressure
Alarm 102 — Circuit A (P.81)
Alarm 103 — Circuit B (P.82)
Alarm 104 — Circuit C (P.83)
Criteria for Trip — The criterion is tested when the compres-
sor is operating to prevent pumpdown conditions when the
suction service valve is closed. This alarm will be tripped if the
economizer pressure is below the suction pressure more than
1 bar (14.5 psi) for more than 10 seconds.
Action to be Taken — The affected compressor will be
stopped.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• suction service valve is closed
• sensor wiring to the EXV boards
MC
ERROR
CODE
MASTER SLAVE DESCRIPTION
01 XX
The master or slave water pump is not configured while the control of the lag unit pump is required
(lag_pump = 1)
02 X Master and slave units have the same network address.
03 X There is no slave configured at the slave address
04 XSlave pump_seq incorrect configuration
05 X
There is a conflict between the master and the slave LWT option: the master is configured for EWT control
while the slave is configured for LWT control.
06 X
There is a conflict between the master and the slave LWT option: the master is configured for LWT control
while the slave is configured for EWT control.
07 X
There is a conflict between the master and the slave pump option: the master is configured for lag pump
control while the slave is not configured for lag pump control.
08 X
There is a conflict between the master and the slave pump option: the master is not configured for lag pump
control while the slave is configured for lag pump control.
09 X X The slave chiller is in local or remote control (chilstat = 3)
10 X X The slave chiller is down due to fault (chilstat = 5)
11 X The master chiller operating type is not Master: master_oper_typ
12 X X No communication with slave.
13 X Master and slave heat cool status are not the same.
EWT — Entering Water Temperature
LWT — Leaving Water Temperature
FC
ERROR
CODE
DESCRIPTION
01 Unit size is unknown.
02 Reclaim option selected for Heat Pump machine.
03 Hot Gas Bypass configured for a Heat Pump machine.
04
Number of Fans controlled by low ambient temperature
head pressure control is greater than expected.